We are extremely delighted to present this Revised Edition of Chemical Sciences which will cover the total need of the student preparing for CSIR-UGC (NET) examination for selection of scholars for Junior Research Fellowship of CSIR and UGC and for determining the eligibility for Lectureship in the Colleges and Universities of India.Our major objective is also to develop confidence among the candidates who are taking competitive examination in the field related to Chemical Sciences providing them solved objective as well as short descriptive type questions which covers both fundamental and practical aspects of the topic. This book is designed to satisfy the challenging requirements of NET (CSIR-UGC), GATE, SET, ONGC, IARI, BARC and M. Phil., Ph.D. Entrance of Various Indian Universities.